It's been one of my major pet peeves on both Android and iOS: the total and utter lack of consistency. Applications - whether first party or third party - all seem to live on islands, doing their own thing, making their own design choices regarding basic UI interactions, developing their own non-standard buttons and controls. Consistency died five years ago, and nobody seems to care but me.

Don't over-dramatise... user experience nowadays enables for tons of people a quite comfortable use of their ~computers - much more so than was the case in the past. Many (most?) even like the new ~smartphone models of interaction, new paths and experiments, which will likely help many more in efficient usage of ~computers.

OTOH, you hold on to a GUI ...basically from the beginning of GUI. It's a virtual certainty that's it's far from optimal (and it didn't see very much uptake or strict cloning).
Movies or music are always better in the old times...